Book excerpt: How can evaluation be used most effectively, and what are the strengths and weaknesses of the various methods? Colin Robson provides guidance in a clear and uncluttered way. The issue of collaboration is examined step-by-step; stakeholder models are compared with techniques such as participatory evaluation and practitioner-centred action research; ethical and political considerations are placed in context; and the best ways of communicating findings are discussed. Each chapter is illustrated with helpful exercises to show the practical application of the issues covered, making this an invaluable introduction for anyone new to evaluation.